My 2000 gagt is having prolems not starting at random times. i can hear the battery turning over but the engine just wont fire! im not sure if it is the spark plugs of the fuel pump. is there any way i can check and fix my problem??? thanks kyle

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IF ENGINE NOT GETTING FIRE.CHECK PCM FUSE MAKE SURE ITS WORKING BECAUSE IT CONTROL FIRE TO SPARK PLUGS ALSO CRANKSHAFT POSITION SENSOR.CHECK TO SEE IF YOU GETTING FUEL.LISTEN FOR FUEL PUMP OPERATION WHEN YOU TURN ON THE IGNITION SWITCH.IF YOU HEAR NO SOUND FUEL PUMP FUSE/RELAY BLOWED OR FUEL PUMP GONE.HAVE VECHICLE SCANNED FIRST PART ARE TOO EXPENSIVE GUESSING.

if battery good starters good that still leaves fuel,air,spark or timing you could try disconnecting throttle body hose that comes from the air filter try starting if still no start spray throttle body cleaner in the throttle while someone starts. Do you hear the fuel pump coming on when turning key to the on position. Have you checked to see if it is getting fire to the plugs?

Today 11-12-08 my 2003 H2 Hummer would not start. Checked battery it ischarged. Cables tight. Tried to start with portable booster pak. No go. Tridto jump start with my wife's Suburban. Still no go.
When I turn the switch I hear a single click and that is it. No engine turning over. While trying to start with key the headlights go out. Out of ideas, Will take to Chevy garage in am. Will post solution.